pluto iau

Officially, Only the Sun Can Have Planets. Is it Time to Fix the Definition of “Planet”?

What is the true definition of a planet, and could there be a more refined definition in the future? This…

4 months ago

Of all the planets in the Solar System. Mercury is now the regarded as the smallest, with a mean radius…

7 years ago

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A new geophysical definition has been proposed by a team of planetary scientists, one which would result in a Solar…

8 years ago

Once known as the 9th planet of the Solar System, Pluto is now classified as a "dwarf planet", a Trans-Neptunian…

9 years ago

So you’ve seen all of the classic naked eye planets. Maybe you’ve even seen fleet-footed Mercury as it reached greatest…

11 years ago